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This is a modified/simplified recipe of Marcella Hazan's famous tomato sauce with onion and butter. To sum up the changes: I don't peel the tomatoes, I slice the onion and sweat it with the butter first, then add the tomatoes. After about an hour simmer, I purée it. This is just easier for me, and I find the taste of the sauce to still be fresh and bright. Here I've doubled the quantities of the original recipe, so feel free to make a half batch or multiply the quantities if you wish, too.